| TIME | EON | BILLION OF YEARS AGO | PLANT EVOLUTION | ANIMAL EVOLUTION | MAJOR GEOLGICAL EVENTS |
| Precambrian | Hadean | 4.6 | Formation of the Earth | ||
| Precambrian | Hadean | 4.5 | Oldest Moon Rocks Heavy meteorite bombardment |
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| Precambrian | Archean | 4 | Oldest Earth Rocks | ||
| Precambrian | Archean | 3.5 | Early Algae | Early Bacteria | |
| Precambrian | Archean | 3 | |||
| Precambrian | Proterozoic | 2.5 | |||
| Precambrian | Proterozoic | 2 | |||
| Precambrian | Proterozoic | 1.5 | Formation of early super-continent | ||
| Precambrian | Proterozoic | 1 |
